Find Your Ring Size at Home
At Factory Direct Jewelry, we believe sizing should be simple. You don’t need fancy tools to find your perfect fit — just a few household items. Use the method that works best for you, and match your measurement to our chart.
Method 1: The String or Paper Test
What you’ll need:
- A strip of paper, string, or floss
- A pen
- A ruler (millimeters are best)
Steps:
- Wrap the paper or string around the base of your finger.
- Mark the point where the ends overlap.
- Lay it flat and measure the length in millimeters.
- Compare the number to our size chart to find your ring size.
| Ring Size (US) | Diameter (mm) | Circumference (mm) |
|---|---|---|
| 4.00 | 15.30 | 48.10 |
| 4.25 | 15.40 | 48.40 |
| 4.50 | 15.50 | 48.70 |
| 4.75 | 15.60 | 49.00 |
| 5.00 | 15.70 | 49.30 |
| 5.25 | 15.95 | 50.00 |
| 5.50 | 16.20 | 50.70 |
| 5.75 | 16.35 | 51.25 |
| 6.00 | 16.50 | 51.80 |
| 6.25 | 16.75 | 52.60 |
| 6.50 | 17.00 | 53.40 |
| 6.75 | 17.15 | 53.85 |
| 7.00 | 17.30 | 54.30 |
| 7.25 | 17.70 | 55.55 |
| 7.50 | 18.10 | 56.80 |
| 7.75 | 18.15 | 57.00 |
| 8.00 | 18.20 | 57.20 |
| 8.25 | 18.38 | 57.75 |
| 8.50 | 18.55 | 58.30 |
| 8.75 | 18.73 | 58.85 |
| 9.00 | 18.90 | 59.40 |
| 9.25 | 19.10 | 60.03 |
| 9.50 | 19.30 | 60.66 |
| 9.75 | 19.55 | 61.44 |
| 10.00 | 19.80 | 62.20 |
| 10.25 | 20.05 | 62.98 |
| 10.50 | 20.30 | 63.76 |
| 10.75 | 20.45 | 64.21 |
| 11.00 | 20.60 | 64.70 |
| 11.25 | 20.83 | 65.43 |
| 11.50 | 21.05 | 66.12 |
| 11.75 | 21.18 | 66.50 |
| 12.00 | 21.30 | 66.90 |
| 12.25 | 21.60 | 67.84 |
| 12.50 | 21.90 | 68.78 |
| 12.75 | 22.05 | 69.25 |
| 13.00 | 22.20 | 69.70 |
| 13.25 | 22.40 | 70.33 |
| 13.50 | 22.60 | 70.96 |
| 13.75 | 22.80 | 71.59 |
| 14.00 | 23.00 | 72.30 |
| 14.25 | 23.20 | 72.93 |
| 14.50 | 23.40 | 73.56 |
| 14.75 | 23.60 | 74.19 |
| 15.00 | 23.80 | 74.80 |
| 15.25 | 24.00 | 75.45 |
| 15.50 | 24.20 | 76.10 |
| 15.75 | 24.40 | 76.75 |
| 16.00 | 24.60 | 77.40 |
Method 2: Measure a Ring You Already Own
What you’ll need:
- A ruler or caliper
- A ring that fits comfortably
Steps:
- Place your ring on a flat surface.
- Measure the inside diameter straight across in millimeters.
- Match that measurement to the chart below.
Method 3: Use Our Printable Ring Sizer
What you’ll need:
- A printer (set to 100% scale)
- Scissors
Steps:
- Print our FDJ Ring Sizer & Chart.
- Cut along the outline to create a paper sizer.
- Wrap the paper around your finger and read the number that lines up.
Ring Size Conversion Chart
| Ring Size (US) | Diameter (mm) | Circumference (mm) |
|---|---|---|
| 4 | 15.3 | 48.1 |
| 5 | 15.7 | 49.3 |
| 6 | 16.5 | 51.8 |
| 7 | 17.3 | 54.3 |
| 8 | 18.2 | 57.2 |
| 9 | 18.9 | 59.4 |
| 10 | 19.8 | 62.2 |
| 11 | 20.6 | 64.7 |
| 12 | 21.3 | 66.9 |
FDJ Sizing Tips
- Evening is best. Fingers are slightly larger at the end of the day, so measure then for accuracy.
- Think about width. Wider bands fit tighter — size up by half a size for anything over 4mm wide.
- Knuckle vs. base. If your knuckle is bigger, measure both and choose a size in between.
- When in doubt, size up. It’s easier to adjust a ring that’s a little loose than one that’s too tight.
How a Ring Should Fit
The perfect fit slides over your knuckle with a little resistance and rests snugly without pinching. You should be able to take it off without struggle — but it shouldn’t slip off too easily.
